Shaping mechanism for grinding wheels



Nov. 4 {1924. 1,513,757

B. M. W. HANSON SHAPING MECHANISM FOR GRINDING WHEELS Filed Oct. 23. 1920 2 Sheets-Sheet 1 B. M. W. HANSON SHAPING MECHANISM FOR GRINDING WHEELS Nov. 4

Filed Oct. 23. 1920 3 Sheets-Sheet 2 avwew m MN a I I,

Nov. 4%, 12d.

atent BENGT M. W. HANSON, OF HARTFORD, CONNECTICUT.

snernve mncenmsm FOR Gnmmnre n Applicationfiled October 23, 1920. Serial No. 419,119.

To all whom it may concern:

Be it known that BENGT M. W. Henson,

I a citizen of the United States, and resident ent invention is peculiarly adapted; but it is to be understood that the present disclosure is by way of illustration, it not being intended to limit the invention to this particular use since it is susceptible of other embodiments than that herein shown.

' vention particularly relates is carried An object of the invention is to provide an improved arrangement of parts for eiiiciently and accurately shaping the edge of a grinding wheel or the like.

A further object of the invention is to make certain improvements of novelty and advantage in a truing or shaping device of the type illustrated and described in my application Serial Number 391,013, filed June 23rd, 1920 and which type is generally characterized by an indexible cutting tool, for instance a diamond point.

In the accompanying drawings, wherein one embodiment which the invention may take-is illustrated,

Fig. 1 is a top plan view of so much of a grinding wheel as is necessary to illustrate the application of my invention.

Fig. 2 is a side view of what is shown in Fig. 1, and

Fig. 3 is a sectional view taken longitudinally through the truing device.

Fig. a is a detail view showing the position of the pins 27 27 on the arm'17.

lhe truing device to which the present inby the slide at which is provided with upstanding boss 10 into which is fitted a stud 11 on the underside of the carrier 12, thus providing means by which the carrier may be indexed into difierent positions to bring the shaping tool carried thereby into 'position'to operate on difierent faces of the grinding wheel. As

here shown, there are three difierent positions into which the carrier can be indexed,

andvmeans are provided for locking the'carrier in each of its indexed positions as by the plunger 13 and the bosses 1 1 recessed to receive the plunger. The axis about which the carrier is indexed is properly positioned relative to the tool (in this place the grinding wheel) so that the three indexing positions will always bring the carrier and tool into proper positions relative to the wheel.

On the upper face of the carrier is a bearing 15 in which is mounted a shaft 16 at the forward end ofrwhich there is formed an arm 17 in which is rotatably mounted a bushing 18 carrying a holder 19 for the diamond point 20. This arm 17 which is oscillated through the shaft 16 turning inthe bearing15, is referred to in some of the claims as an indexible member for it sup:

ports the diamond point, and in the presen instance is indexed through being moun on the carrier 12.

By reference to Fig. 1 it will be clearthat as the shaft 16 is rocked in its bearing 15 the diamond point mounted at the outer end of the arm 17, which is either fixed to or is a part of the shaft 16, will be caused to os-' cillate back and forth across a face of the wheel, and by indexing the carrier to either of the three indexed positions here illustrated it will be apparent that the sides and the edge of the wheel can be shaped.

There are instances, as in' the preliminary shaping of a wheel intended to produce a Whitworth thread, where it is necessary to move the diamond point up to a shoulder, and it is'not only advisable but in some cases necessary that a stop should be provided to limit the oscillating motion of the diamond. point in the direction towards the shoulder. For this purpose the bearing 15 is provided with a pair of symmetrical branching arms having at their ends stop faces 24, 25 which cooperate with a stop pin 26 adjustably mounted on the rear end of the bushing 18. This stop pin. can be adjusted so that it will contact with one of the stop faces, as 25, to precisely limit the extent of the oscillation of the diamond'point up to the shoulder of the wheel.

It will be apparent that if the .diamond point'be slightly off center a proper setting or limiting of its oscillatory movement for one side of the other side and, in order to eliminate this difiiculty, the bushing 18, in which the diamond point holder 19 is mounted, is made rotatable so that it can be turned through an ale, let us say, of 180, means being nrovied, as the pins 27, 27, to hold the bushing in either of these positions. This means that if the stop pin 26 be adjusted with reference to one of the stop faces 25 (as shown in Fig. 1) so as to establish the properlimitation of the oscillatory movement of the shaft 16 and its arm 17 toward the shoulder, then by turning the bushing 18 one half of a complete revolution the posite face ot the wheel from that uponwhich it is operating as shown ,in Fig. 1, the oscillation of the shaft 16 and its arm 17 will be limited so as to produce the same amount of cutting or shaping action on the face of the wheel, it being of course understood that the carrier is indexed to the opposite position from that shown in Fig. 1.

By thus providing for turning the diamend point into a new position an necesas a handle the arm.

sityfor accurately positloning the iam'ond oint in its holder min the bushing is'elimmated and the identical shaping of each side of the wheel is insured,

I 'llh adjustable stop pin 26 maywell serve for turning the bushing 18 on lnop eration, it will be seen that with the parts shown in the position of Fig. 1, upon oseillation of the diamond point to operate on'an" angular face of the, grinding wheel, the screw 23 will cooperate with the stop 25 tolimit theextent of movement of the diamend point'towards the shoulderat the base of theledge eerie grinding wheel. 'lo surficfeth'e other angular face of the wheel the other is indexed to its other extreme" position and the, bushing 18 with its diamond point" holder is turned in the arm 17 to rest dian'iond point.

on the other pin 27 and then the diamond point is oscillated, the extent to which this angular face is cut bmk being limited by the engagement of the screw 23 against the stop The cutting edge of the wheel may then be'truncated by indexing the carrier to a central position and oscillating the After the grinding wheel has been preliminarily shaped as just described, the slide d together with the truing device thereon be moved out of the way and then the slide 9/ is moved forward to bring the roller 6 into operative position relative to the:

- grinding wheel. This roller is longitudinally fluted as at 35 and provided with-one or more eirumierential g'roovesl36 c0naormmg no size and shape precisely to that of images the cut to be taken, which cut, in the present instance, is a Whitworth thread. The roller is mounted for free longitudinal movement so that upon engagement of the grinding wheel with the walls of one of the grooves 36, the roller will be brought into proper position. During the final shaping operation, the grinding wheel is slowly rotated as by manually pulling the belt 0, the result being that the roller will rotate in the opposite direction at approximately the same peripheral speed. The walls of the groove 36 will have a picking o-r-crushing action on' the edge of the grinding wheel quickly bringing the same to the final shape desired. F or a detail description of this shaping wheel reference may be had to a copending application filed of even date herewith.

ll claim as my invention 1. In a device for shaping the active edge of a grinding wheel, an indexible member, means for oscillating it in its indexed positions, means for limiting the extent of oscillatory movement of said member in its indexed positions, a tool holder carried by said member, and means for positioning said holder at like distance from and at either side of a predetermined center on said member.

2. In a device for shaping the active edge of a grinding wheel, an indexible member, means for oscillating it in its indexed ositions, means for limiting the extentiot osmember in its indexed positions, means for I limiting the oscillatory movement. of said member towards the base of" the cutting edge of said wheel to a like extent on'each! side thereof, a diamond point carried by said member, and. means for positioning said point at diametrically opposite sides a of a predetermined center on said member.

4c. lln a device for shaping the activeedge of a grinding wheel, a member indexible to Doperate n the opposite side faces of the wheel, means for oscillating said member its indexed positions, stops for limiting movement of said member towards the of the cutting edge of the wheel and to a like extent on each side thereof, a tool tatably carried by saidmember, and means movement of saidfor limiting the rotary tool to an angle out 5.. lln a device for shaping the active of agrinding wheel, member indexible to operate on the opposite side faces of he 7 wheel, means for oscillatin said member in portfor movement into 'andout of operaits indexed positions, a too carried ba said tive relation to said wheel. member, means for positioning sa' fromone side of a predetermined center -'on scribed, a support, a g'rindin Wheel joursaid member to a like distance on the other nalled thereon, a slide mountedon said supside thereof, and means cooperating with 'port'; a truing device on said slide including said positioning means for limiting the exa diamondpoint, means for indexing it to tent of movement of said, member towards opposite sides of the 'wheeland into a positool 10. In an apparatus of the character de the base of the cutting edge of the wheel tion for truncating the edge thereof, means I 10 and to a like extent on each sidethereofl for oscillating sa d diamond point in its 6. In a: device for shaping the active edge indexed position, means for limiting the of a grinding wheel, an indexible member, movement of said diamond point inwardly means for oscillating the same, a pair ofof the wheel to a like extent on each side stops, a tool carried by said member, and thereof; means for positioning said slide means for rotating said tool through an with said diamond point in proper relation angle of 180 relative to said member and to the grinding wheel, a'second slide, means adapted to cooperate with said stops to. limit on sai -second slide for rounding off the the oscillation of saidm'ember.

7. In a device for shaping the active edge by said diamond point, and means for movcorners between the plane surfaces formed of a grinding wheel, an indexible member, in said second mentioned slide so as to means for oscillating the same in its 1nbring said means for rounding off the cordexed positions, a tool carried by said memners into operative relation with saidgrindher, an adjustable handle for rotating said lng wheel.

tool through an angle of 180 relative to said 11. In an apparatus of the character demember, and a pair of stops cooperating scribed, a support, a grinding wheel jourwith said handle for limiting the osclllation nalled thereon, a slide; a truing device on of said member. v said slide including a diamond point, means 8. In a truing device an indexible carrier, for indexing it to opposite positions of a a shaft journalled thereon, an arm on said wheel and into a position for truncating the 50 shaft, means'for oscillating said arm, a tool edge thereof, means for oscillating said dia-I 'holder rotatabl carried by said arm, an mond pointv in .its indexed positions, and adjustable han e for turning said holder means for limiting the movement of said 180 in said arm, and a pair of opposed diamond point inwardl of the tool to a stops arranged on said carrier to cooperate like extent on both si es thereof;- means with said handle to limit the oscillation -for positioning said slide, with said diamond of said arm. a point in proper relation to saidgrinding 9. In an apparatus of the character dewheel, a second slideon said support, a

scribed, a support, a grindin wheel jourlongitudinally fluted roller journalled on nalled thereon, means on sai support for said second slide and having a circumfere'n-m 49 shaping the cutting edge of the grinding tial groove corresponding in size and shape wheel to the approximate shape of a Whitto the Whitworth thread to be cut, and means worth thread, and means on said support for moving said second mentioned slide 'for for then finishing theedge of the wheel to bringing said roller into 0 rative engagethe'exact shape'of a Whitworth thread both ment with said gindin w eel. J

' BE G'rii. w, HANSON.

of said means being supported on said sup- 

